Burner



C. M. HUNTER T AL March 11, 1930.

. BURNER Filed May 2 192? 2 Sheets-Shee 1 I/III March 11, 1930.

BURNER Filed May 2 1927 2 Sheets-Sheet 2 III I c. M.- HUNTER EI'AL 1,749,942

Patented Mar. 11, 1930 UNITED STATES PATENT OFFICE CAMPBELL M. HUNTER AND HAROLD P. PHILIP OT, OF LONDON,

BURNER ENGLAND Application filed May 24, 1927, Serial No. 193,888, and in Great Britain September 7, 1926;

Our invention relates to atmospheric gas and oil burners of relatively large capacity designed primarily for use for industrial purposes. The principal object of our invention is to provide improved means whereby the motive fluid may be most effectively ememployed for ejecting or inducing into the mixing chamber of such burners the ingredie'nts comprising the combustible mixture and for securing their subsequent atomization and thorough admixture.

A feature of our invention consists in providing the mixing chamber of the burner with jet means involving spaced concentric ports providing a passage between them, one of the walls of said passage being substantially cylindrical and the other being substantially conical.

Another feature of the invention consists of a burner having a mixing chamber and a plurality of jets arranged in spaced relation one within the other and communicating with said chamber, the space between the jets forming the passage for the motive fluid employed and increasing in cross sectional area in the direction of flow of the motive fluid.

Another feature of the invention consists of a burner having a mixing chamber and a jet, the space within the jet forming the passage for the motive fluid increasing in cross sectional area in the direction of flow of said motive fluid.

In the drawings showing a preferred form of our invention,-

Figure 1 is a view, partly in elevation and partly in section, of a burner embodying our invention.

Figure 2 is a sectional view taken on the line 2-2, Fig. 1.

Figure 3 is a sectional view taken on the line 33, Fig. 2.

Figure 4 is a sectional view illustrating a modified form of our invention.

Figure 5 is a sectional view similar to Fig. 4, illustrating a preferred form of the invention as applied to a burner adapted to burn gas only, or to a combined burner for gaseous and liquid fuels when vapor from the liquid fuel is employed as the motive fluid.

tion as disclosed in gure 6 is a sectional view similar to Fig. '5, illustrating a modified form of the invensaid Fig. 5.

The burner to which our invention has been applied forms the subject matter of an application of Campbell M. Hunter, one of the inventors hereof filed May 24, 1927, Serial No. 193,889. As described therein the burner '1 is shown as formed with a chamber2 into which the various fluids comprising the combustible mixture are adapted to flow and wherein they are intimately and effectively mixed before being discharged therefrom. For inducing increased velocity of flow of the mixture from the chamber the latter is formed with a contracted exit throat 3 merging into a somewhat larger discharge nozzle 4.

Above the mixing chamber and on opposite sides thereof, the burner has a gas port 5 and an air port 6.

These ports may advantageously be tangentially arranged with respeo t to the mixing chamber and their axes are preferably, coincident with one another and substantially normal to the longitudinal axis of the burner.

Adjustably mounted in the port 6 for controlling the admission of air is a screw threaded apertures 8, the eff valve member 7 having ective size of which may be varied by rotating the valve in the desired direction. Secured 7 preferably by means of a finger 10 which may,

spring employed for fricti to a portion of the valve rivet 9, is a if desired, be

onally engaging With the wall of the port for maintaining the valve in a given position of, adjustment.

The gas port is interiorly threaded to receive a valved gas supply pipe (not shown).

This port has communication with the air port 6 and both of'the ports have communication with an opeiiin wall of the mixing chamber 2 so that the gas and air may enter common point.

11 formed in the top the mixing chamber at a To the rear of the mixing chamber 2 and preferably in axial alinement therewith is a detachably connected heating chamber 12. A diagonally extending partition wall 18 divides this latter chamber into longitudinally disposed compar tments 14 and 15. These compartments are provided with internally threaded ports or openings 16 and 17, preferably diametrically opposed, for connection, respectively, with valved oil and steam. supply pipes (not shown).

The wall of jacent the mixing chamber 2 projects forwardly into the latter and is provided with an opening 18 constituting a steam jet. The opening is preferably lined with a rustless annulus 19 cast in place, such annulus being advantageously made of Monel metal. 7

Concentrically spaced within the steam jet 18 and coextensive therewith is the oil jet 20 having communication with the oil compartment 14 through the radial openings 21. The oil jet extends through an aperture 22 in the partition wall 13 and is detachably mounted in the rear wall of the heating chamber in the opening 28. By this means the oil jet may be readily removed without disassembling the burner for the purpose of cleaning the steam and oil jets or for replacement of the latter. The opening is eflectively sealed by a detachable screw threaded plug 24.

To create a reduced pressure in the mixing chamber adjacent the discharge end of the oil jet and adjacent the common air and gas inlet for the purpose of causing the fluids to flow into the mixing chamber by induction, the

, annular space or passageway between the jets increases in cross sectional area in the direction of flow of the motive fluid, which is preferably steam.

. In the preferred form of the invention, as illustrated in Figs. 1, 2 and 3, this passage way of increasing cross sectional area is delined by the substantially cylindrical inner peripheral surface of the steam jet andthe substantially conical outer peripheral surface 25 of the discharge end of the oil jet which tapers toward the mixing chamber. In the modification shown in Fig. 4 a similar passageway is formed by the substantially conical peripheral surface of the steam jet, tapering' away from the the substantially cylindrical outer peripheral surface of the discharge end of the oil jet.

While the burner illustrated in the principal figures of the drawing, by proper manipulation of valves (not shown), is capable of burning a mixture of oil, gas, air and steam, or oil, air and steam, or gas, air and steam, in varying proportions, Figs. 5 and 6 illustrate the invention as it may be applied to the burner when it is desired to burn only a mixture of gas only, or to the burner when vapor from a liquid fuel is employed as the motive uid in place of steam. In Fig. 5 the passageway of increasing cross sectional area is defined by thesubstantially cylindrical inner "peripheral surface of the jet for the motive cfiuid and the substantially conical outer peripheral surface 26 of the solid plug memthe steam compartment 15 ad omitted.

va plurality of spaced relation mixing chamber, and

1,749,942 i l i Figs. 1 and 2, the only sub- 3 sageway may also be formed by the substantially conical inner peripheral surface of the jet for the motive fluid, the plug 27 being By constructing and arranging the jets in the manner herein described a burner is pro duced whereby both gaseous and liquid fuels and air, or gaseous fuel and air, are elficlently induced into the mixing chamber and whereby a more thorough atomization of the fuel and consequent intermingling of all of the fluids comprising the combustible mixture and the subsequent complete combustion of- .the latter is obtained.

7 conditions steam will prove to be the most effective inducing and atomizing agent, it is obvious that to meet certain requirements any fluid under pressure, such as air or'vapor, may be employed.

1. In a burner of the fluid fueltype, the combination of a mixing chamber, means for conducting gaseous fuel to said chamber, and jets arranged in concentric While under most ducting fluids to said chamber, the space between said jets forming the nozzle for a motive fluid and increasing in cross sectional grog in the direction of flow of said motive one within the other for con- 2. A burner of the fluid fuel type having a mixing chamber, air and gas ports hav- .1ng through the side of the latter, and jet means s d c a communication with said chamber also havlng communication with ber, the said jet means providing amotive fluid passage increasing in crosssectional area toward the mixing chamberand being arranged so that the air and gas are'caused to be ejected into said chamber by the flow of motive fluid through said passage.

3. A burner of the fluid fuel type having a mixing chamber, means for conducting" chamber, a steam jet and being arranged'in spaced type having a" the direction of flow of the fluids,

coextensive for the major portion of one of said jets, the space between the jets forming a passage for the steam and increasing in cross sectional areain the direction of flow of the oil and steam.

5. A burner of the fluid fuel type having a mixing chamber, a steam jet, and an oil jet annularly spaced within the latter, one of said jets being coextensive for its major portion with the other of said jets, the inner peripheral wall of the steam jet being substantially cylindrical and the outer peripheral wall of the oil jet being substantially conical so that the annular space between said jets increases in cross sectional area in and said mixing chamber having a gaseous fuel port and an air port.

6. A burner of the fluid fuel type havin a mixing chamber, a steam jet, and an oi jet annularly spaced within the latter and being coextensive therewith for substantially its entire length, the jets being so formed and arranged that the annular space between said jets'increases in cross sectional area in the direction of flow of the fluids, and said mixing chamber being provided at opposite sides of said chamber with axially alined air and gas ports.

In testimony whereof we aflix our signatures.

' CAMPBELL M. HUNTER.

HAROLD P. PHILPOT. 

